The Optimal Blood Use Manual is a resource for improving safety and effectiveness of the clinical transfusion process. We wanted to find out how the manual was used, if it was still useful and whether it needed to be revised or expanded. Contributors and other stakeholders of the EU Optimal Blood Use Manual project were contacted via email on the 21 May 2013. Instead of taking answers through an online survey, recipients were simply asked to answer three questions by replying to the email.